<!DOCTYPE html>
<html lang="en"  xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!--左侧菜单栏-->
<nav th:fragment="topNav" class="navbar-default navbar-static-side" role="navigation">

</nav>
</body>
</html>